Sheet packing and gasket



May 6, 1941. R, L KREUZ 1 2,240,789

' SHEET PACKING AND GASKET Filed Feb. 23, 1939 INVENTOR BY Robert L. Kreuz rlL/vu ATTORNEY Patente'd "May 6,1941

A UNITED .STATE s PATENT OFFICE snEE'r racismo AND GASKET r .Robert L. yKreumDetroit, Mich., assign'or to Wol- .verine Fabricating Manufacturing Gompany,

u Inc.,l ii,l corporation of Michigan l v 1' Application February 23, 1939, Serial No. 257,935. i claims. .(cl. zas-34) able on the openmarket. :Becausev of the w importance of the characteristics of this base sheet, in the vpresent combination, it will be identified more specifically, although the manuhas improved characteristics of strength, ilexibility and durability and from which improved packing material improved gaskets may be conveniently and cheaply stamped or cut.

It is also an object of my invention to provide .i

an improved sheet packing material comprising a base sheet of chemically vulcanized liber sheet and the base sheet having on both opposite sides a seating or sealing coat' oi a material, mixture or compound having a ,Thiokol base or similar commonly known synthetic rubber material, to greatly enhance the seating properties of the surface of the base sheet and effect a good sealing engagement when used as a seal between two adjacent surfaces.

It is a further object of my invention to pro- I vide improved gaskets comprising a flexible base sheet .having a sealing or seating coating of a ",'Ihiokol` base or' a similar synthetic rubber material, the bare edges of the base sheet being exposed at'the edges of the gasket, and the base sheet being of a strong, durable, oil-proof, chemically-vulcanized ber sheet whereby the gasket is not deteriorated by the seepage of oil or other fluids therethrough from the edges.

Further objects and advantages are within the scope of my invention such as relate to the improved characteristics of my product and t0 economies of manufacture and numerous other features, as will be apparent from a consideration V thickness thereof being substantially exaggerated for clearness:

. Fig. 2 is a plan view showing a gasket cut or stamped from the sheet packing material; and Fig. 3 is asectional view on line 3-'3 thereof. .Referring more particularly to Fig'. 1 of the drawing, my improved sheet packing material comprises a base sheet I of a chemically vulcanized fiber sheet, which I have found possesses unusually desirable characteristics for this purpose. Suchbase sheet material is readily obtainfacture of this base sheet, per se, is nota part of' the present invention'.

Such vulcanized fiber' sheet, which is used for a Abase sheet. is usually made from pure cotton, much like pure cotton paper, and it is treated with zinc chloride which changes the nature of the cotton so that it can no longer be detected as such. The chemical is then. washed out thoroughly. 'Thin sheets are thenv built up and pressed together in a laminated arrangement to fabricate the liber sheet material. This chemically vulcanized fiber sheet material may also be made by another process in which sulphuric acid is the vulcanizing agent. Such chemically vulcanized laminated sheet material is readily available on the market.

I have found the characteristics of such a base sheet of chemically vulcanized fiber sheet to be quite superior`to the properties ofother sheet materials previously used for making gaskets, or for similar packing purposes, and a base of such fiber sheet may be usedrv which is very much thinner than is possible with the materials previously used. The chemically vulcanized liber base sheet is inherently oil-proof. Also this sheet lmaterial has very superior strength, flexibility and durability for such purposes, and a very thin base sheet may be used although shown thick in the drawing for clearness.

However, although such fiber sheet has such desirable characteristics, the surface thereof is rather hard and unyielding for use for gaskets and for packing purposes. By applying a sealing or seating coat 3 of a suitable material, mixture, or compound, upon the opposite exposed surfaces of the base sheet I of chemically vulcanized'ber sheet, I have found it possible to greatly enhance the seating properties of the surface of such a fiber sheet to provide for good seating engagement with adjacent clamping surfaces between which it may be used as a seal. By such an arrangement it is possible to more effectively and successfully utilize the desirable characteristics of a base sheet of the chemically vulcanized fiber sheet for gaskets and similar purposes.

For the sealing or seating coat 3 on the surfaces of the base sheet I of chemically vulcanized fiber sheet, I apply coatings of a Thiokol base or a similar synthetic rubber material. The term Thiokol is a trade name under which one form of suitable coating material may be readily obtained on the market. This coating material may befcoated upon the outer surfaces of thebasesheet Iinanysuitablemannerasbytaking a roll of the ilber sheet, reeling the iihersheet from one roll to another roll and passing it through an-'intermediately positioned vat of the coating material. after'whichitisdriedinany suitable manner, as will be readilyunderstood.

` Such coating material is practically oil proof and clamping surfaces and form a good sealed joint therewith.

It will be seen that I have provided an improved sheet packing material which may`bc cheaplyl manufactured, which has good seating characteristics and desirable properties of strength and durability under the conditions of otherform desired, may be very conveniently and cheaply stamped or cut in any well known manner from alarge sheet of my improved packing-material, as will be understood. when so formed, the gaskets are ready for use without the necessity.. of additionally coating the raw edges because thebase sheet I of the chemically vulcanized sheet material is resistant to oil and other. deteoratinggeiects. The base sheet `I serves as the gasket material which does not require protection, and the coatings 3 on the op- .posite side surfaces of'the base sheet serve to provide a good sealing seat against any abutting solid surface.

' This is also an important property of my improved packing material and of the gaskets made from itbecause when a gasket is installed and clamped Vbetween two Ametallic members 9, as represented by the dotted lines in Fig. 3, the inner edge ofthe base sheet I is exposed to the iluid or medium --whicl'is to be held under pressure.v as indicated by the arrows. As the edges.

of my gaskets do not require a protective coating. the life'of the gasket is not limited by the life of .such a protective coating nor is it necessary to exercise particular care to avoid breaking or scratching an edge protective covering when handling or installing the gaskets. When a gasket 1 is installed between two metal members 9, as represented in Fig. 3, the seating or sealing coats 3 of the gasket engage the adjacent exposure-and use towhich such materials are usually subjected, and which may be conveniently and cheaply cut or stamped to form' gaskets having similardesirable characteristics.

I claim:

1. 'A packing and gasket sheet material comprising,y a'base sheet of a chemically vulcanized fiber, said sheet being substantially incompressible and being resistant to deterioration by oil or the like iluids, and a relatively thin coating of a' compressible sealing material applied on both faces of said sheet, said sealing material being resistant to deterioration by oil or the like uids. 2.AV packing and gasket sheet material comprising. a base sheet of a chemically vulcanized fiber, said sheet being substantially incompressible and being resistant to deterioration by oil .or the like iiuids, and a relatively thin coating of synthetic rubber materialapplied on opposite faces. of said sheet, said synthetic rubber material-being resistant to deterioration by oil or the like fluids.`

3. A gasket comprising, a-base sheet of chemically vulcanized ber, said sheet being substantially incompressible and being resistant to deterioration by oil or the like fluids, and a'relatively thin coating of synthetic rubber material applied on the seating faces of said gasket, -said synthetic rubber material being resistant toy de- ROBERT L. KREUZ. 

